The way it's looking there'll never be a Halo movie. Ah well! So long as regular humans keep making killer props like this, we're free to imagine our own. Which is always for the best, because then, they never end up sucking.

If you don't recognise it, it's Carter's helmet, with Carter being your squad's leader in Halo: Reach. The helmet goes nice with some of his other stuff, including a complete ODST suit of armour and various individual Halo helmets (like Noble Six's), all of which you can see in more detail at the link below.